The only thing that are annoying about the mine five is the sharing answer method in almost every leg and high school mental bullying, and yes, it took away the fun in audience's perspective.
However 1.) The alliance isn't actually essentially controlling the boot order, and most of them were eliminated because of their own mistake (Like the Cajun sisters lost for couple hours driving in Paris, or Leo & Alana couldnt separate flagpoles and spears, and even with the yield, either the blondes would have used yield without the alliances encouragement, or L/A were far behind even without the yield). The only thing that is debatable is the blondes, because of the taxi driver , but then again even without 40 mins yield, they would have had a lesser chance to survive because they were so far behind with the other teams (they reached the swiggy detour after H/C finished)
2.) They play for the big money (not including the gov. Tax). They would do anything to get into the final three and win the race, and having alliances with the stronger teams would guarantee them far. Yes some alliances take away the fun and this is the case, but I've seen far more annoying alliance in the past seasons and this is while the extreme case of answer sharing method, is still bearable. And yes they want to get the prizes, so well, they would do anything to get the prizes as long as it doesn't violate the rules. I do agree tho that the producers need to review and modify rules or challenges so there wouldn't be any potential mass answer sharing for the next seasons, if we ever get any in this uncertain times